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Modifying method for improving performance of stainless steel pump material

A kind of material performance, stainless steel pump technology, applied in metal material coating process, liquid chemical plating, coating, etc., can solve the problems of short service life, low hardness and surface strength of stainless steel, poor wear resistance, etc., to improve the durability Corrosion resistance, improve working efficiency and service life, combine good effect

Inactive Publication Date: 2019-06-11
大连四方佳特流体设备有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hardness and surface strength of stainless steel are low, and the wear resistance is poor. The application conditions of the centrifugal pump are various, especially when there is a high-speed gas (including corrosive gas and non-corrosive gas) and a certain amount of dust particles. Under such harsh working conditions, the stainless steel surface is used under such harsh working conditions for a long time, not only the work efficiency is low, but also the service life is short

Method used

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  • Modifying method for improving performance of stainless steel pump material
  • Modifying method for improving performance of stainless steel pump material
  • Modifying method for improving performance of stainless steel pump material

Examples

Experimental program
Comparison scheme
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example 1

[0024] The test piece is a martensitic stainless steel impeller, impeller type: semi-open; medium working conditions: 3-10% sulfuric acid, 50% ammonium sulfate mixed solution, solid content 15%, particle size less than 2mm; medium specific gravity: 1.4; medium Viscosity (mPa.s): 1.73; Medium temperature (℃): 0-110; Inlet pressure (absolute pressure) MPaA: 0.1; Flow rate (m3 / h): 3; Head (m): 20; NPSHa (m): 2;

[0025] First, pre-treat the test piece, manually remove machining residues, rinse with cold water; place the test piece in a 10% (wt.%) sodium hydroxide solution at a temperature of 70 ° C for 15 minutes to remove oil, and then wash it with 90 ° C water Rinse to remove residual lye, then rinse with cold water; soak the test piece in a mixed solution of 9ml / l hydrofluoric acid and 14ml / l nitric acid at room temperature for 2 minutes to remove rust, then rinse with cold water; place the test piece in Soak in a mixed solution of 7g / l ammonium bifluoride and 17g / l sulfosali...

example 2

[0030] The test piece is 304 stainless steel impeller, impeller form: semi-open; medium working condition: 3-10% sulfuric acid, 50% ammonium sulfate mixed solution, solid content 15%, particle size less than 2mm; medium specific gravity: 1.4; medium viscosity ( mPa.s): 1.73; medium temperature (℃): 0-110; inlet pressure (absolute pressure) MPaA: 0.1; flow rate (m3 / h): 3; lift (m): 20; NPSH NPSHa (m ):2;

[0031] First, pre-treat the test piece, manually remove machining residues, rinse with cold water; put the test piece in a 7% (wt.%) sodium hydroxide solution at a temperature of 90 ° C for 15 minutes to remove oil, and then wash it with 70 ° C water Rinse to remove residual lye, and then rinse with cold water; soak the test piece in a mixed solution of 13ml / l hydrofluoric acid and 11ml / l nitric acid at room temperature for 5 minutes to remove rust, and then rinse with cold water; place the test piece in Soak in a mixed solution of 9g / l ammonium bifluoride and 15g / l sulfosal...

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Abstract

The invention discloses a modifying method for improving performance of a stainless steel pump material. The modifying method comprises the steps that the surface of a flow passage component of a stainless steel centrifugal pump is plated with a Ni-P amorphous plating film by a chemical plating technology, and the thickness of the plating film is 10-100 [mu]m. The modifying method comprises the specific steps that a test piece is subjected to pretreatment such as cleaning, alkaline washing, acid pickling, activation and pre-plating treatment; the test piece is subjected to chemical nickel-phosphorus plating treatment, the test piece is placed in a plating solution, and film plating is carried out under the environment that the temperature is 80-100 DEG C, the PH is 4.5-5.0, and the platingspeed is 12 [mu]m / h; and plating film thermal treatment is carried out, specifically, firstly, annealing dehydrogenation and stress releasing treatment are carried out at the temperature of 200 DEG C, then thermal treatment is carried out according to different performance requirements, and the temperature range is 300 DEG C-400 DEG C. According to the modifying method for improving the performance of the stainless steel pump material, bonding of the plated Ni-P amorphous plating film and a stainless steel substrate is good, when the thickness of the plating layer is 10-100 [mu]m, the hardness HV is 550-1100 ( which equals to HRC 55-72), and the bonding strength is greater than 15 kg / mm<2>; and the anti-corrosion property of the amorphous plating film is greatly better than stainless steel, and the working efficiency of the centrifugal pump is improved, and the service life is prolonged.

Description

technical field [0001] The invention relates to a method for surface treatment of stainless steel materials, in particular to a method for surface modification of flow-passing parts of stainless steel centrifugal pumps. Background technique [0002] As we all know, stainless steel has good corrosion resistance and is a general fluid machine widely used in chemical, petroleum and other industrial systems. Its main flow parts such as pump body, impeller and pump cover are all made of stainless steel. A variety of product series are derived from centrifugal pumps due to different operating temperatures, media and environments. However, the hardness and surface strength of stainless steel are low, and the wear resistance is poor. The application conditions of the centrifugal pump are various, especially when there is a high-speed gas (including corrosive gas and non-corrosive gas) and a certain amount of dust particles. Under such harsh working conditions, the application of st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/36C23C18/18
Inventor 孙玉霞庄春瑜陈明翔潘国强边红艳杨静王海
Owner 大连四方佳特流体设备有限公司
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